WO2019091825A1 - Utilisation d'une composition aqueuse pour la fabrication additive d'un corps façonné métallique - Google Patents

Utilisation d'une composition aqueuse pour la fabrication additive d'un corps façonné métallique Download PDF

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Publication number
WO2019091825A1
WO2019091825A1 PCT/EP2018/079691 EP2018079691W WO2019091825A1 WO 2019091825 A1 WO2019091825 A1 WO 2019091825A1 EP 2018079691 W EP2018079691 W EP 2018079691W WO 2019091825 A1 WO2019091825 A1 WO 2019091825A1
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Prior art keywords
aqueous composition
layer
melting
sintering
metal powder
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PCT/EP2018/079691
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German (de)
English (en)
Inventor
Andreas Bauereiß
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Heraeus Additive Manufacturing Gmbh
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Publication of WO2019091825A1 publication Critical patent/WO2019091825A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/165—Processes of additive manufacturing using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/40—Radiation means
    • B22F12/41—Radiation means characterised by the type, e.g. laser or electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • Additive manufacturing processes work without tools and without form.
  • the volume of an object is built up in layers according to a digital computer model.
  • metallic moldings can be produced via an additive manufacturing.
  • the additive manufacturing takes place via a jet melting or jet sintering of a metal powder (powder bed-based process).
  • beam sources laser or electron beams are used (selective laser beam melting or sintering, selective electron beam melting or sintering).
  • the material to be processed is applied in powder form in a thin layer on the building board or a previously deposited material layer.
  • the powdered material is locally completely melted by laser radiation and forms a solid layer of material after solidification.
  • the building board is lowered by the amount of a layer thickness and again applied powder. This cycle is repeated until the final molded article is obtained.
  • selective electron beam melting the local melting of the powder takes place by means of an electron beam.
  • WO 98/24574 A1 describes a method for producing a shaped body by selective laser sintering or laser melting, wherein a metallic material powder is applied and melted by the laser beam, the laser beam in several tracks over the predetermined region of the material powder layer is performed so that each subsequent track of the laser beam partially overlaps the previous track and a protective gas atmosphere is maintained over the interaction zone of laser beam with the metallic material powder.
  • the powder bed-based processes using metal powders have certain disadvantages.
  • metal powders can be very reactive due to their high surface area, there are increased requirements for their safe handling.
  • Some metallic powders have low absorption compared to common types of lasers, which requires the use of more powerful lasers.
  • lasers As described by M. Naeem, Laser Technology Journal, Volume 10, January 2013, pp. 18-20, and in US 2015/0102016 A1, in particular copper, gold, silver or aluminum are compared to conventional lasers having a wavelength in the infrared range work, a very low absorption.
  • WO 2017/037165 A1 describes an additive manufacturing method by selective laser melting or sintering, wherein the powder material to be melted or sintered is applied in layers in the form of a suspension.
  • suitable metallic materials for this process titanium and tungsten are mentioned.
  • a protective gas is passed over the applied in the form of a film metal powder-containing suspension.
  • this gas stream can lead to premature evaporation of the suspension liquid, even before the selective melting or sintering step has been completed. This leads to an uncontrolled degree of moisture of the mixture and requires sufficiently fast processing of the metal powder suspension in the installation space, since otherwise there is again a dry powder bed with the disadvantages described above.
  • An object of the present invention is to provide an additive manufacturing method by jet melting which avoids the above-mentioned disadvantages of a powder bed process, in particular the increased safety requirements due to reactive metal powders, and can be effectively performed even for metals with low laser beam absorption allows temporal flexibility in the implementation of the method steps. Furthermore, the metal powder should exhibit good reflow behavior (e.g., in the form of good wetting of the substrate by the molten metal powder).
  • the object is achieved by the use of an aqueous composition containing a metal powder and a humectant, for the additive production of a metallic shaped body by jet melting or sintering.
  • the metal powder Since the metal powder is not used in a dry state, but in the form of an aqueous composition, eliminates the increased Safety requirements.
  • the presence of the moisturizing agent in the aqueous composition prevents premature dehydration.
  • the moisture content of the composition can be kept relatively constant even after its introduction into the space over a longer period of time and thus increases the temporal flexibility in the implementation of additive manufacturing.
  • the presence of a humectant results in a more efficient reflow of the metal powder both in comparison with an aqueous medium containing no humectant and in comparison with a dry metal powder.
  • beam melting or sintering is preferably laser beam melting or sintering or electron beam melting or sintering.
  • Humectants are known in the art, for example from the field of cosmetic preparations.
  • the humectant is a polyol or a polyhydroxy compound (ie, a compound having at least two hydroxy groups), a mono or polyalkoxy compound (ie, a compound having one or more alkoxy groups) or an amino acid or a mixture of at least two of these compounds.
  • the polyhydroxy compound is glycerin, a glycol (eg, ethylene glycol, propylene glycol, butylene glycol), a sugar alcohol (eg, sorbitol, mannitol, glucitol, isomalt, lactitol, xylitol, threitol, erythritol or arabitol), a polyalkylene glycol (eg, diethylene glycol, dipropylene glycol, a polyalkylene glycol with a number average molecular weight of ⁇ 5000 g / mol, more preferably ⁇ 2000 g / mol, more preferably ⁇ 500 g / mol), an oligo- or polysaccharide or a mixture of at least two of these compounds.
  • a glycol eg, ethylene glycol, propylene glycol, butylene glycol
  • a sugar alcohol eg, sorbitol, mannitol, glucito
  • the polyalkylene glycol is, for example, a polyethylene glycol or a polypropylene glycol.
  • the polyalkylene glycol has a number average molecular weight of ⁇ 5000 g / mol, more preferably ⁇ 2000 g / mol, still more preferably ⁇ 500 g / mol.
  • the determination of the number average molecular weight can be carried out, for example, by wet chemical OH number determination in accordance with DIN 53 240 or in accordance with the method described in US 2010/0240864 A1.
  • the oligosaccharide or polysaccharide is, for example, a galactose-containing polysaccharide (eg agarose, agar).
  • the mono- or polyalkoxy compound may be, for example, a monohydroxy compound or else an OH-free compound.
  • the polyalkoxy compound preferably contains one or more ethoxy and / or propoxy groups.
  • the alkoxy groups may be present for example as terminal groups. Two or more alkoxy groups may be present in the compound immediately following each other.
  • the mono- or polyalkoxy compound is obtained, for example, by alkoxylating (eg, ethoxylating and / or propoxylating) one or more hydroxy groups in one of the abovementioned polyhydroxy compounds, such that an alkoxylated monohydroxy compound or an alkoxylated hydroxy -free connection is present.
  • the humectant is, for example, present in a proportion of 0.1 to 60% by volume, more preferably 0.5-50% by volume.
  • Density of the humectant are determined.
  • the humectant is water-soluble.
  • the humectant has a solubility in water of at least 1 g / L, more preferably at least 5 g / L, even more preferably at least 7 g / L or even at least 10 g / L.
  • aqueous composition indicates that the composition contains water, and that the water content and thus also the consistency of the aqueous composition can be varied over a wide range.
  • the aqueous composition is a suspension with very high flowability
  • the aqueous composition contains water in an amount of 1% by volume to 50% by volume, more preferably 2% by volume to 45% by volume, or 3% by volume to 40% by volume %.
  • the aqueous composition may already contain water when it is introduced into the installation space of the jet melting apparatus or when applied to the substrate in a layered manner.
  • the metal is a noble metal (e.g., gold, silver, platinum, palladium, ruthenium, rhodium or iridium), a semi-precious metal (especially copper), a refractory metal (e.g., titanium), or a light metal (e.g., aluminum or magnesium).
  • the metal may be in elemental form, in the form of an alloy or an intermetallic phase.
  • alloying of a metal is understood to mean an alloy which contains this metal as the main component (for example in an amount of more than 50 at%) and, next to this, one or more alloying elements
  • Refractory metals are base metals of transition group 4 (titanium, zirconium, Hafnium), 5th subgroup (vanadium, niobium, tantalum) and 6th subgroup (chromium, molybdenum, tungsten), the melting point of which is preferably above the melting point of platinum.
  • Suitable particle sizes of a metal powder in the context of an additive manufacturing process are known to the person skilled in the art or, if appropriate, can be determined by routine experiments.
  • the metal powder has a mass-related dso value in the range of 10 ⁇ to 200 ⁇ .
  • the dso value is determined, for example, by laser diffraction.
  • Suitable metal powders are commercially available or can be prepared by methods known to those skilled in the art.
  • the aqueous composition also contains a flux.
  • fluxes are commonly used in soldering metals.
  • the presence of a flux in the aqueous composition can lead to a further improvement in the melting behavior of the metal powder under the action of the beam source.
  • Suitable fluxes are, for example, those which are mentioned in DIN EN 1045: 1997 as a flux for brazing.
  • the flux is a boron-containing compound, a phosphate, a silicate, a boron-free chloride, or fluoride (eg, an alkali metal, alkaline earth metal, or ammonium fluoride or chloride).
  • a boron-containing compound for example, boric acid, boron oxides (eg, B2O3), borates (eg, alkali metal, alkaline earth metal or ammonium borates) or fluoroborates (eg, alkali metal, alkaline earth metal or ammonium fluoroborates) may be mentioned.
  • the borate is for example a metaborate or a tetraborate.
  • the flux is present, for example, in a proportion of 0.5 to 50% by volume.
  • the beam melting or beam sintering is preferably a laser beam melting, a laser beam sintering or an electron beam melting or sintering. These techniques are often referred to as “selective”, i.e., selective laser beam melting, to express that the energy input of the beam source is based on the computer model only in predefined regions of the applied layers.
  • the present invention also relates to a method for additive production of a metallic shaped article by jet melting or jet sintering
  • the beam melting or jet sintering is preferably a laser beam melting or sintering or an electron beam melting or sintering.
  • the beam source is therefore preferably a laser beam or an electron beam.
  • the substrate may be the still uncoated building board of the beam melting or sintering device or, alternatively, material layers of the shaped body which have already been deposited on the building board beforehand.
  • the provision of the aqueous composition in the form of a layer on the substrate can be carried out, for example, by applying the aqueous composition to the substrate using customary auxiliaries known to the person skilled in the art.
  • the layered application of the aqueous composition is carried out, for example, by a doctor blade, a roller, a press or by screen printing or a combination of at least two of these methods.
  • step (ii) can be carried out without further intermediate steps.
  • the water content of the aqueous composition by a suitable measure eg, by treatment with the beam source, so that some of the water evaporates, but a melting or sintering of the metal powder preferably still does not take place
  • the provision of the aqueous composition in the form of a layer on the substrate can also be effected, for example, by first coating a dry metal powder on the substrate and subsequently supplying the water to this dry powder layer.
  • a moistening unit eg in the form of one or more nozzles
  • the humectant may, for example, be present in the subsequently added water (eg dissolved or dispersed in the water). If a solid humectant such as a polysaccharide is used, for example, it may already be applied in layers to the substrate together with the dry metal powder or may be present in the subsequently added water.
  • the application of the dry powder layer can be carried out by the same means as the application of the aqueous composition, that is, for example, a doctor blade, a roller or a press.
  • a metal powder generally consists of metal powder particles between which there are interparticle voids. In a dry powder, these interparticle voids are completely filled with a gas. If it is a wet or moist powder, the interparticle cavities may be partially or even completely filled with the liquid present.
  • the voids present between the metal powder particles may be completely filled with water, the humectant, and optional additives (such as the flux). In a preferred embodiment, however, the voids present between the metal powder particles are partly present at the beginning of step (ii) filled with a gas. These are, for example, the inert protective gas (eg nitrogen or a noble gas), in the presence of which the additive manufacturing process is carried out.
  • the inert protective gas eg nitrogen or a noble gas
  • the layer S1 when the voids present between the metal powder particles are partially filled with a gas (eg, the inert gas of the additive manufacturing method) at the beginning of the step (ii), a further improvement in the reflow behavior of the metal powder can be achieved.
  • a gas eg, the inert gas of the additive manufacturing method
  • the relative volume fractions of the water, the humectant and optional additives can be used to control whether the voids present between the metal powder particles are completely filled by these components or if there is still a residual volume left in these interparticle voids
  • the inert inert gas can be completed.
  • the total volume of the layer S1 provided on the substrate results from the sum of the volumes of the individual components, ie
  • the volume of one or more additives VAdditiv if present, the volume of the gas Vcas.
  • the volume of the layer S1 provided on the substrate can therefore be expressed by the following relationship:
  • V gas is > 0 (ie, the interparticle voids present between the metal powder particles are partially filled with a gas at the beginning of step (ii)).
  • the layer S1 provided on the substrate at the beginning of step (ii) satisfies the following condition:
  • Vcas / V layer S1 is> 0.06 or even> 0.08.
  • step (ii) satisfies the following condition:
  • step (ii) the selective melting or sintering of the metal powder in the layer S1 formed by the aqueous composition is carried out by a beam source. Whether a melting or sintering of the metal powder takes place can be controlled, for example, by the radiation intensity.
  • the beam source is preferably a laser beam or an electron beam.
  • selective is known to express that takes place in the context of additive manufacturing of a molded article, the melting or sintering of the metal powder based on digital 3D data of the molding only in defined, predetermined areas of the layer.
  • step (iii) After solidification of the molten or sintered metal powder, in step (iii), the above-described aqueous composition is provided in the form of a further layer S2 on the previously provided layer S1.
  • the provision of the further layer S2 can take place in the same way as the provision of the layer S1.
  • the metal used to provide the layer S2 may match the metal used to provide the layer S1. Alternatively, however, it is possible to use a powder of another metal for the layer S2.
  • step (ii) and step (iii) the building board is preferably lowered by an amount which essentially corresponds to the layer thickness of the layer S1.
  • This procedure in the context of the additive production of a shaped body is generally known to the person skilled in the art.
  • step (iv) With regard to the selective melting or sintering of the metal powder in the layer S2 formed by the aqueous composition by a jet source in step (iv), reference may be made to the above statements on step (ii). For example, even at the beginning of step (iv), the voids present between the metal powder particles are partially filled with a gas (e.g., the inert protective gas of the additive manufacturing process).
  • a gas e.g., the inert protective gas of the additive manufacturing process.
  • steps (i) - (iv) are preferably carried out in the presence of an inert protective gas such as nitrogen or a noble gas. Due to the inert protective gas, a protective gas atmosphere is formed in the installation space of the jet melting or jet sintering device, which prevents unwanted oxidation of the metal. Steps (iii) and (iv) are preferably repeated one or more times, e.g. until the completion of the metallic molding.
  • an inert protective gas such as nitrogen or a noble gas. Due to the inert protective gas, a protective gas atmosphere is formed in the installation space of the jet melting or jet sintering device, which prevents unwanted oxidation of the metal.
  • Steps (iii) and (iv) are preferably repeated one or more times, e.g. until the completion of the metallic molding.
  • the present invention further relates to an aqueous composition containing a metal powder and a humectant.
  • a humectant a metal powder and a humectant.
  • the metal powder and optional additives such as a flux
  • aqueous composition containing copper powder and agar (i.e., a polysaccharide) as a humectant was prepared.
  • the aqueous composition contained water in a proportion of 29.5% by volume. Based on the water, the humectant was present in a proportion of 1, 7 vol%.
  • the aqueous composition was applied in the installation space of the device in the form of a thin layer (layer thickness about 200-400 ⁇ ) on the building board.
  • the melting of the metal powder in defined areas of the applied layer was carried out at room temperature.
  • Argon was used as the inert protective gas in the installation space. It took about 10 minutes to establish a stable protective gas flow.
  • the laser melting step was started.
  • the laser beam moved at a speed of 5000 mm / s with a beam power of 95 W and a distance of adjacent lines of 1 ⁇ m over a predefined area of 2 ⁇ 2 mm 2 of the applied layer of the aqueous composition.
  • the image shows that the copper powder was melted very efficiently and the molten copper nearly completely covers the area covered by the laser beam.
  • Comparative Example 1 a dry copper powder was used.
  • the copper powder corresponded to the copper powder used in Example 1.
  • the dry copper powder was applied in the installation space of the device in the form of a thin layer (layer thickness about 200-400 ⁇ ) on the building board.
  • the melting of the metal powder in defined areas of the applied layer was carried out at room temperature.
  • Argon was used as the inert protective gas in the installation space. It took about 10 minutes to establish a stable protective gas flow.
  • the laser melting step was started.
  • the laser beam moved at a speed of 5000 mm / s at a beam power of 95 W and a distance of adjacent lines of 1 ⁇ over a predefined area of 2 x 2 mm 2 of the applied layer of dry copper powder.
  • Comparative Example 2 an aqueous composition containing a copper powder but no humectant was used. At the time of preparation, the water content of the aqueous composition was 60% by volume.
  • the copper powder corresponded to the copper powder used in Example 1.
  • the humectant-free aqueous composition (water content: 60% by volume) was applied in the space of the device in the form of a thin layer (layer thickness about 200-400 ⁇ ) on the building board.
  • the melting of the metal powder in defined areas of the applied layer was carried out at room temperature.
  • Argon was used as the inert protective gas in the installation space. It took about 10 minutes to establish a stable protective gas flow.
  • the laser melting step was started.
  • the laser beam moved at a speed of 5000 mm / s at a beam power of 95 W and a distance of adjacent lines of 1 ⁇ over a predefined area of 2 x 2 mm 2 of the applied layer of humectant-free aqueous composition.
  • aqueous composition containing copper powder and glycerin as a humectant was prepared.
  • the aqueous composition contained water in a proportion of 5.2% by volume. Based on the water, the humectant was present in a proportion of 42.5% by volume.
  • the copper powder corresponded to the copper powder used in Example 1.
  • the aqueous composition was applied in the space of the device in the form of a thin layer (layer thickness about 100-200 ⁇ ) on the building board.
  • the melting of the metal powder in defined areas of the applied layer was carried out at room temperature.
  • Argon was used as the inert protective gas in the installation space. It took about 10 minutes to establish a stable protective gas flow.
  • the laser melting step was started.
  • the laser beam moved at a speed of 500 mm / s at a beam power of 95 W and a distance of adjacent lines of 10 ⁇ over a predefined area of 2 x 2 mm 2 of the applied layer of the aqueous composition.
  • a dry copper powder was used.
  • the copper powder corresponded to the copper powder used in Example 1.
  • the dry copper powder was applied in the installation space of the device in the form of a thin layer (layer thickness about 100-200 ⁇ ) on the building board.
  • the melting of the metal powder in defined areas of the applied layer was carried out at room temperature.
  • Argon was used as the inert protective gas in the installation space. It took about 10 minutes to establish a stable protective gas flow.
  • the laser melting step was started.
  • the laser beam moved at a speed of 500 mm / s at a beam power of 95 W and a distance of adjacent lines of 10 ⁇ over a predefined area of 2 x 2 mm 2 of the applied layer of dry copper powder.
  • Table 1 Melting behavior of the layers applied to the building board compositions
  • a humectant results in a more efficient reflow of the metal powder both in comparison with an aqueous medium containing no humectant and in comparison with a dry metal powder. This effect can be observed both for a polymeric humectant (polysaccharide, experiment 1) and for a low-molecular humectant (glycerol, experiment 2).

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Abstract

La présente invention concerne l'utilisation d'une composition aqueuse qui contient une poudre métallique et un agent mouillant pour la fabrication additive d'un corps façonné métallique par fusion ou frittage par rayonnement.
PCT/EP2018/079691 2017-11-07 2018-10-30 Utilisation d'une composition aqueuse pour la fabrication additive d'un corps façonné métallique WO2019091825A1 (fr)

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EP17200340.2A EP3479927A1 (fr) 2017-11-07 2017-11-07 Utilisation d'une composition aqueuse pour fabrication additive d'un corps métallique moulé
EP17200340.2 2017-11-07

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Citations (6)

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WO1998024574A1 (fr) 1996-12-02 1998-06-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Frittage au laser selectif a temperature de fusion
US20100240864A1 (en) 2007-01-19 2010-09-23 Basf Se Method for changing the predefined mean molecular weight mn during the continuous production of polytetrahydrofuranes or the copolymers
US20150102016A1 (en) 2013-07-29 2015-04-16 Siemens Energy, Inc. Laser metalworking of reflective metals using flux
WO2015136360A1 (fr) * 2014-03-14 2015-09-17 Lincoln Global, Inc. Flux dépourvu d'acide borique
WO2017037165A1 (fr) 2015-09-01 2017-03-09 Stichting Energieonderzoek Centrum Nederland Procédé et appareil de fabrication d'additif
EP3181271A1 (fr) * 2015-12-17 2017-06-21 Seiko Epson Corporation Procédé de production d'articles tridimensionnels, appareil de production d'articles tridimensionnels et article tridimensionnel

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